Display device

Abstract

A display device includes: a first sub-pixel including a first first-type light emitting element configured to emit light in a blue wavelength band, the first sub-pixel being configured to emit light in the blue wavelength band; a second sub-pixel configured to emit light in a green wavelength band; and a third sub-pixel including a second first-type light emitting element configured to emit light in the blue wavelength band, a third-type light emitting element configured to emit light in a red wavelength band, and a first wavelength conversion layer, the third sub-pixel being configured to emit light in the red wavelength band. A threshold voltage of the third-type light emitting element is lower than a threshold voltage of the second first-type light emitting element.

What is claimed is: 
     
         1 . A display device comprising:
 a first sub-pixel comprising a first first-type light emitting element configured to emit light in a blue wavelength band, the first sub-pixel being configured to emit light in the blue wavelength band;   a second sub-pixel configured to emit light in a green wavelength band; and   a third sub-pixel comprising a second first-type light emitting element configured to emit light in the blue wavelength band, a third-type light emitting element configured to emit light in a red wavelength band, and a first wavelength conversion layer, the third sub-pixel being configured to emit light in the red wavelength band, a threshold voltage of the third-type light emitting element being lower than a threshold voltage of the second first-type light emitting element.   
     
     
         2 . The display device of  claim 1 , wherein the second sub-pixel comprises a second-type light emitting element configured to emit light in the green wavelength band. 
     
     
         3 . The display device of  claim 1 , wherein the second sub-pixel comprises a third first-type light emitting element configured to emit light in the blue wavelength band and a second wavelength conversion layer configured to convert light in the blue wavelength band to light in the green wavelength band. 
     
     
         4 . The display device of  claim 1 , wherein a luminous efficiency of the second first-type light emitting element is higher than a luminous efficiency of the third-type light emitting element. 
     
     
         5 . The display device of  claim 1 , further comprising:
 a blue color filter corresponding to the first sub-pixel and configured to transmit only blue light;   a green color filter corresponding to the second sub-pixel and configured to transmit only green light; and   a red color filter corresponding to the third sub-pixel and configured to transmit only red light.   
     
     
         6 . The display device of  claim 5 , wherein the first wavelength conversion layer is located between the second first-type light emitting element and the third-type light emitting element, and the red color filter, and comprises a wavelength conversion material configured to convert light in the blue wavelength band to light in the red wavelength band. 
     
     
         7 . The display device of  claim 6 , wherein the wavelength conversion material comprises a quantum dot or a phosphor. 
     
     
         8 . The display device of  claim 5 , wherein the first wavelength conversion layer is located between the second first-type light emitting element and the third-type light emitting element, and the red color filter, and comprises a wavelength conversion material configured to convert light in the blue wavelength band and light in the red wavelength band to light in a yellow wavelength band. 
     
     
         9 . The display device of  claim 1 , wherein the third-type light emitting element comprises an InGaN-based element. 
     
     
         10 . The display device of  claim 1 , wherein the third sub-pixel comprises a pixel electrode and a common electrode,
 wherein the second first-type light emitting element and the third-type light emitting element are connected between the pixel electrode and the common electrode, and   wherein the second first-type light emitting element and the third-type light emitting element are connected in parallel.   
     
     
         11 . The display device of  claim 1 , wherein the third sub-pixel comprises a pixel electrode and a common electrode,
 wherein the pixel electrode and the common electrode are non-overlapping with each other in a thickness direction of the second first-type light emitting element and the third-type light emitting element,   wherein a portion of the second first-type light emitting element and a portion of the third-type light emitting element are on the pixel electrode, and   wherein another portion of the second first-type light emitting element and another portion of the third-type light emitting element are on the common electrode.   
     
     
         12 . The display device of  claim 1 , wherein the third sub-pixel comprises a pixel electrode and a common electrode,
 wherein the pixel electrode and the common electrode overlap each other in a thickness direction of the second first-type light emitting element and the third-type light emitting element,   wherein the second first-type light emitting element and the third-type light emitting element are on the pixel electrode, and   wherein the common electrode is on the second first-type light emitting element and the third-type light emitting element.   
     
     
         13 . A display device comprising:
 a first sub-pixel, a second sub-pixel, and a third sub-pixel that are configured to emit different color lights,   wherein the third sub-pixel comprises more diverse types of light emitting elements than the first sub-pixel, and   wherein the third sub-pixel comprises different types of light emitting elements that are configured to emit different color lights and have different threshold voltages.   
     
     
         14 . A display device comprising:
 a first sub-pixel comprising a first-type light emitting element configured to emit light in a blue wavelength band, the first sub-pixel being configured to emit light in the blue wavelength band;   a second sub-pixel configured to emit light in a green wavelength band;   a third sub-pixel comprising a third-type light emitting element configured to emit light in a red wavelength band, the third sub-pixel being configured to emit light in the red wavelength band; and   a fourth sub-pixel comprising a second first-type light emitting element configured to emit light in the blue wavelength band and a wavelength conversion layer, the fourth sub-pixel being configured to emit light in the red wavelength band, a threshold voltage of the third-type light emitting element being lower than a threshold voltage of the second first-type light emitting element.   
     
     
         15 . The display device of  claim 14 , wherein the third sub-pixel and the fourth sub-pixel are adjacent to each other. 
     
     
         16 . The display device of  claim 14 , wherein a luminous efficiency of the third-type light emitting element is lower than a luminous efficiency of the second first-type light emitting element. 
     
     
         17 . The display device of  claim 1 , wherein the second sub-pixel comprises a second-type light emitting element configured to emit light in the green wavelength band. 
     
     
         18 . The display device of  claim 14 , further comprising:
 a blue color filter corresponding to the first sub-pixel and configured to transmit only blue light;   a green color filter corresponding to the second sub-pixel and configured to transmit only green light; and   a red color filter corresponding to the third sub-pixel and the fourth sub-pixel and configured to transmit only red light.   
     
     
         19 . The display device of  claim 18 , wherein the wavelength conversion layer is located between the second first-type light emitting element and the red color filter, and comprises a wavelength conversion material configured to convert light in the blue wavelength band to light in the red wavelength band. 
     
     
         20 . The display device of  claim 14 , wherein the third sub-pixel comprises a pixel electrode and a common electrode, and
 wherein the third-type light emitting element is connected between the pixel electrode and the common electrode,   wherein the first type light emitting element and the third type light emitting element are connected in parallel.